Improvement in saw-mills



UNITED STATES PATENT ()FFI E.

JAMES HAMILTON, OF NEW YORK, N. Y.

IMPROVEMENT IN SAW-MILLS.

Specification forming part of Letters Patent No. 43,688, dated August 2, 1864.

To all whom it may concern:

Be it known that I, JAMES HAMILTON, of the city and State of New York, have invented, made, and applied to use a certain new and useful Improvement in Mills for Sawing Timber-for Vessels, 85c. and 1 do hereby declare the following to be a full, clear, and exact description of the said invention, reference being had to the annexed drawings, making part of this specification, wherein- Figure l'is an elevation of my saw-gate fitted with saws that stand at right angles to v the gate, and Fig. 2 is a cross-section of the said gate with that character of saw. Fig. 3 is an elevation of the gate with saws that are hung on swivels, so that they may be turned into a position inclined to the saw-gate for cutting bevels or curves, and Fig. 4 is a crossscction showing said gate with this saw for curvilinear or bevel sawing.

Similar marks of reference denote the same parts.

This invention is an improvement upon and associated with a certain invention of mills for curvilinear sawing for which Letters Patent were granted to me April 13, A. D. 1852. In the said Letters Patent a gate was formed to receive the saws, which saws were strained in separate inner gates that could be slid crosswise of the main gate to determine the position of the saw laterally, so that the timber itself could be cut by the saw at any point within a given distance on each side of the center of the mill; but the gate setforth'in the said Letters Patent was limited in capacity because the saws could be moved but a small distance apart; hence difficulty has been experienced in sawing wide logs.

The nature of my present invention consists in a mode of hanging the saws upon separate stretchers within the main gate that can be moved laterally for regulating the position of the cut of the saws, so that with the same sized main gate to the mill a much wider log can be sawed than heretofore, and the same facility is given as in aforesaid patent for guiding the saw or saws in cutting bevels and compound or simple curves.

In the drawings, 0 O are the sidebars, and O G the top and bottom bars forming the main saw-gate. This is to be sustained in slides of any usual character. I have, however, shown the bars I) D for receiving the slideblocks on the gate, and the pitmen E E, the same as in aforesaid Letters Patent. The bars G C are fitted'with sliding pipes or collars L L, connected together by the stretcher.- bars I I, from which arms K K project to receive the saws. The saws J J are hung by straps over the arms K K of the character shown in Fig. 2, in which the saw cannot be turned for following curves or bevels, but can be set farther out or in upon the arms K, and there retained by a set-screw, 1, or said saw may be hung, as shown in Fig. 4, with abuckle, K and sciew, so that it can be turned into a position diagonal or inclined to the plane of the gate to saw curves or bevels.

It will now be seen that the stretcher 1,

arms K, and collars or pipes L form an auxili- The auxiliary or inner saw-frames, fitted to move laterally in the main saw-gate, are to be slid across the gate while the sawing progresses by the means shown in the aforesaid Letters Patent or, if desired, for parallel straight sawing the inner gates may be held in place by screws 2 2.

My invention greatly increases the capacity of the aforesaid patented saw-mill without materially increasing the weight of the parts.

What 1 claim and desire to secure by Letters Patent is- I The inner or auxiliary saw gates or frames, fitted to slide; laterally in the main saw-gate, substantially as and for the purposes speci-. fied.

Dated June 10, 1864.

JAMES HAMILTON. Witnesses:

A. I. HAMILTON, LEMUEL W. SERRELL. 

